Since you seem to be a fan of using Ebay, I'll add another link that way.
I'd recommend an AMD processor based Laptop (A8). They undervolt and/or overclock well, as I have 2 of the same series.
This allows you to have the power when you need it, but when you don't, allows for a very comfortable low temp for long term use.
http://www.ebay.com/itm/Brand-New-HP-ENVY-dv6z-Laptop-AMD-Quad-Core-A8-4500M-1-9GHz-/111036773475?pt=Laptops_Nov05&hash=item19da4eb463They can run very cool, they undervolting/overclocking tools are very easy to use (k10stat).
Also you can mine on them and if you just want to do them as a hobby that is no problem, it handles it fine, without over heating.
I'm not suggesting it can mine very well, but if you want to do that, like others have suggested you'd want to go with something more designed for it.